Later Atomic Models Through the first part of the twentieth century, atomic models continued to change. REMEMBER: Electrons are the subatomic particles that are lost, gained or shared in chemical reactions. Modern Atomic Model Accepted since the 1930s At the center of the atom is a massive nucl...
Batteries develop electrical voltage through chemical reactions. When a battery dies, it has exhausted its original store of chemical fuel. The LED, however, does not rely on an internal fuel to generate voltage; rather, it converts optical energy into electrical energy. So long as there is li...